I just found this really amazing Encrypted chat tool it's called Cryptocat and it's free! You can check it out here: https://crypto.cat

It follows OTR (Off the record) protocol and it's a really great tool.

Now here's the fun part it does not have any Sign Ups or anything. Now you must be wondering how do I contact someone then? Well, all you (and your friends) need to have the same conversation name. Well, it's quite simple Conversation Name should be the same. Thats all.